這是一個小的測試代碼,它將背景設置爲itext塊對象。我打算做的是使用反射在塊對象上執行以下方法 塊大塊=新的塊(); BaseColor baseColor = new BaseColor(45,90,135); chunk.setBackground(baseColor);帶反射的IllegalArgumentException
package com.blubench.test;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.itextpdf.text.Chunk;
public class BaseColorReflection {
static final String methodName = "setBackground";
static final String className = "com.itextpdf.text.Chunk";
static final String param = "com.itextpdf.text.BaseColor";
public static void main(String[] args) throws ClassNotFoundException, SecurityException, NoSuchMethodException, IllegalArgumentException, InstantiationException, IllegalAccessException, InvocationTargetException {
//**********Target Class**************
Class<?> chunkClass = Class.forName(className);
Chunk chunk = (Chunk) chunkClass.newInstance();
//*********Parameter to Target Method*********
Class<?> baseColorClass = Class.forName(param);
Class<?>[] argTypes = {int.class,int.class,int.class};
Constructor<?> baseColorCtor = baseColorClass.getDeclaredConstructor(argTypes);
Object[] argValues = {45,90,135};
Object baseColorObject = baseColorCtor.newInstance(argValues);
//*********Target Method****************
Method method = chunkClass.getDeclaredMethod(methodName,baseColorObject.getClass());
try {
//***********Invoke Target Method on Target Class with Parameter**********
method.invoke(chunk, baseColorObject.getClass());
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
這就是我得到
java.lang.IllegalArgumentException異常:在 sun.reflect.NativeMethodAccessorImpl.invoke在 sun.reflect.NativeMethodAccessorImpl.invoke0(本機方法)的參數類型不匹配(來源不明)處 java.lang.reflect.Method.invoke(來源不明) sun.reflect.DelegatingMethodAccessorImpl.invoke(來源不明)在 com.blubench.test.BaseColorReflection.main(BaseColorReflection.java:33)
這是一個非常普遍的問題,但我無法確定是什麼原因造成的?